public int mode(List<Integer> numList) {
    //Holds frequencies
    int[] frequencies = new int[Collections.max(numList)+1];

    for(int i=0; i<numList.size(); i++) {
        frequencies[numList.get(i)]+=1;
    }

    //Convert to List
    List<Integer> freqArray = IntStream.of(frequencies).boxed().collect(Collectors.toCollection(ArrayList::new));

    int maxFreq = Collections.max(freqArray);
    int mode = freqArray.indexOf(maxFreq);

    return mode;
}